25,26-Bis(propan-2-ylidene)heptacyclo-[20.2.1.110,13.0 2,21.03,8.09,14.015,20]hexa-cosa- 2(21),3,5,7,9(14),11,15,17,19,23-decaene

In the title compound, C32H28, the central cyclo-octa-tetra-ene ring has a boat conformation, and the molecule is saddle shaped. The seat is defined by the mean plane of the four-atom attachment points (r.m.s. deviation = 0.014 Å) of the two bicyclo-heptenyl substituents. These substituents comprise the pommel and cantle, with each mean plane defined by four atoms proximate to the seat (r.m.s. deviations = 0.002 and 0.004 Å). Relative to the seat, the pommel and cantle bend up 31.16 (4) and 29.40 (5)°, while the benzo units (flaps, r.m.s. deviations = 0.006 and 0.009 Å) bend down 36.75 (4) and 38.46 (4)°. The mean planes of the dimethyl-ethyl-idene units are almost perpendicular to the saddle seat, making dihedral angles 86.89 (4) and 88.01 (4)°. © Cooper et al. 2012.